How to call one variable into another in value.yaml of helm chart

Question

How to call one variable to another in value.yaml of a chart? for example, this is the value.yaml

app: "test"
count: 1
frontend:
  image: "mydockerhub/$app"
  replicaCount: $count
backend:
  image: "mydockerhub/backend"
  replicaCount: $count

Here one line 1 and 2. I am assigning values to app and count. Now I want to use this variable in defining frontend image and replicacount.

I know I can directly update the variables in values.yaml but the original values.yaml is quite big and complicated.

P.S I am trying to access a parameter's value into another in Value.yaml itself, not any configmap or any other file.

Answer 1

Can't YAML Anchors be the solution? See https://helm.sh/docs/chart_template_guide/yaml_techniques/

It would give something like this:

app: "test"
count: &appCount 1
frontend:
  image: "mydockerhub/$app"
  replicaCount: *appCount
backend:
  image: "mydockerhub/backend"
  replicaCount: *appCount

Answer 2

You can't use parameters from values.yaml inside values.yaml, since the values file is not evaluated.